UX: When clicking an activity date, pop up a little menu with options to

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config/locales/client.en.yml

@@ -30,6 +30,9 @@ en:
             mb: MB
             tb: TB
     dates:
+      time: "h:mm a"
+      long_no_year: "MMM DD h:mm a"
+      long_with_year: "MMM DD, YYYY h:mm a"
       tiny:
         half_a_minute: "< 1m"
         less_than_x_seconds: